Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
A starfish has how many arms?
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The ratio of wave height to wavelength is the wave's what?
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Which of the following traits are used to help classify whales as mammals?
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What is the most common contaminant found in fish?
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Male orca whales have a life expectancy of 50 - 60 years, what is the life expectancy of female orca whales?
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About how many million tons of salt are obtained from the ocean each year?
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What percentage of the ocean's volume is in coastal zones?
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What famous ship sank to the bottom of the Atlantic Ocean in 1912?
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